Don’t handle the vase as if it made of steel.A. is B. were C. has been D. had been

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A. is
(答案→)B. were
C. has been
D. had been
解析：考察虚拟语气。As if似乎，好像；后面的句子如果是事实，就使用陈述语气；如果不是事实，就使用虚拟语气。根据句意可知这里的花瓶并不是铁做的。故与现在的事实相反，用过去时。B正确。